MacKay said Canada needs to have all viable options on the table to replace the current fleet of 1980s-vintage CF-18s, which the government says will reach the end of their projected service life around 2020.

He reiterated that Canada wants to buy 65 jets for about $9 billion. But escalating costs and delays have dogged the F-35, which is now the most expensive U.S. Department of Defense procurement program ever.

A KPMG report says the lifetime cost of Canada owning 65 F-35ís is estimated at $45.8 billion over 42 years.